Since there is a maximum of 16 rows, we store the row address in a 4 bit number.

由于最多有 16 行，我们将行地址存储在一个 4 位数字中。

For this, we use an instruction address register, which as the name suggests, stores the memory address of the current instruction.

为此，我们使用一个指令地址寄存器，顾名思义，它存储当前指令的内存地址。